Six-wheel car-truck.



H. M. PFLAGER. SIX WHEEL OAR TRUCK. APPLIOATIOI nun mm. 6; 91:.

1,1 05,300, Patented m 28, 914

UNITED STATES: PATENT OFFICE.

IH ARR Y M. PFLAGER, or S LOUIS, MISSOURI, ASSIGNOR r DOUBLE BODYBOLSTER COMPANY, OF saamoors, MISSOURI, A CORPORATION OF NEW JERSEY.

SIX-WHEEL CAR-TRUCK.

To whom it may concern:

Be itknown that I, HARRY M. PFLAGER 1 a citizen ofthe United States,residing a l the city of St. Louis, State of Missouri,

- exact description, such as will enable others skilled in the art towhich it appertains to make and use the same, reference being had to theaccompanying drawings, forming part of this specification, in whichFigure 1 is a side elevational view of a six wheel truck of my improvedconstruction. Fig. 2 is a plan view of the truck. Fig-3 is an enlargeddetail section taken approximately on the line 3-3 of Fig. 2.

This invention relates generally to new and useful improvements in cartrucks, and more particularly to a one piece center bolster and themanner of mounting the same upon the cross bolster of a six wheel cartruck. 5

In six wheel car trucks provided with an X or.H-shaped center bolster ithas usually been the practice to rigidly connect the ends of the arms ofthe center bolster to the cross bolsters, and where such construction iscarried out andone of the forward wheels of the truck passes over asharp rise in the track, such as for instance, an uneven rail joint, thecorresponding or adjacent corner or the center bolster is elevated, thusthrowingthe load onto two diagonally opposite corners, and this actiondoubles the load on the two opposite diagonal corners by reason of thebolster being formed in a single piece, and consequently said bolstermust be made of extra strength and consequent-1y very heavy in order tomeet these conditions. K

In the construction of my improved truck ,I propose to make the crossbolsters separate from the center bolster and'to mount said centerbolster upon said cross bolsters so that it will not only be properlysupported thereby, but will be flexibly connected thereto, so that whileone of the forward wheels rises in passing over a sharp elevation of thetrack rail the joints between the center bolster and cross bolsters willyield thereby overcoming all tendency of the forces produced to distortor strain the center bolster,

Specification of Letters Patent.

Patented July 28, 1914.

Application: filed September 5, 1913. Serial N 0. 788,296.

By my improved construction, it is pos slble to make the cross bolstersand center bolstencomparatively light in weight and yet said parts willhave the requisite strength to meet all M. C. B. requirements andservice conditions' a To the above purposes my invention cons sts 1ncertain novel features of construction and arrangement of partshereinafter lmore fully described and claimed.

Referring by numerals to the accompanylng drawings, 10 designates thewheel pieces of a six wheel truck frame, 11 the transoms, 12 the usualequalizers, the ends of which rest upon the journal boxes, and 13 thecross bolsters, which are yieldingly supported on springs carried byspring planks, which latter are supported from the truck frame by meansof suitable swing hangers.

The cross bolsters 13 may be of any desired cross sectional shape andformed in the top surfaces thereof near their ends are slightly concavedrecesses or bearing seats 14. Formed integral with the cross bolstersand projecting upwardly from the centers of these recesses are tubularlugs or bosses 15.

The center bolster 16 as contemplated by my invention is formed in asingle piece preferably by casting, substantially X-shape in plan viewand arranged on top of the central portion of this bolster is a centerbearing 17. The arms of this bolster are preferably box-shape in crosssection although they may be of any desired cross sectional shape, andthe ends of said arms are provided 011 their undersides with convexbearings 18 which rest in the-concave bearing seats 14.

Formed integral with the bearings 18 and projecting upwardly into theends of the arms of the bolster are cylindrical housings 19 whichreceive the cylindrical lugs. or bosses 15. The recesses in thesehousings 19 are slightly larger in diameter than the diameter of thelugs of bosses 15, and thus each cross bolster has slight lateral playwith respect to the arms of the bolster which are supported by saidcross bolsters. Thus, when the brakes of the truck are applied, thecross; bolsters will move horizontally a slight degree under the forcesset up by the application of said brakes,

and the tubular lugs orxbosses 15 bearing ings of these bolts within theends of the arms of the. bolster are nuts 21. There is' sufficient spacebetween these nuts and the top walls of the cross bolster to permitslight vertical play between the cross bolsters and the ends of thebolster arn1s,'and which play occurs Whenever any one of the forwardwheels passes over a high joint or a sharp rise in one of the trackrails.

The ends of side bearing arches 22 are positioned on the ends of thearms of the bolster 16 near the sides of the truck, and said arches maybe cast integral with the center bolster or formed separate and attachedthereto as shown in Fig. 2.

By yieldingly o'r flexibly connecting the center bolster to thecrossbolsters the torsional strains transmitted to the bolster as aresult of the truckwheels passing over sharp elevations in the .trackrails are reduced'to a minimum and such construction also tends to moreevenly distribute the weight of the load upon the cross bolsters andside frames of the truck, than wlrere' the center bolster and crossbolsters are formed integral or rigidly connected.

My improved construction provides substantially universal bearingsbetween the arms of the bolster and the cross bolsters, and thus onecross bolster can rock or yield slightly independent of'the other.

A truck of my improved construction is simple, comparatively light inweight, and at the same time has the requisite strength to meet allordinary service conditions. By flexibly mounting the center bolsterupon the cross bolsters all tendency of strains and forces to'distortsaid bolsters is overcome.

It will be readily understood that minor changes in the size, formandconstruction of the various parts of my improved six wheel car truck maybe made and substituted for those herein shown and described, withoutdeparting from the spirit of my invention, the scope of which is setforth in the appendedclaims.

I claim: 3

1. In a car truck, the combination with a pair of cross bolsters, of acenter bolster having pairs of arms with one pair bearing on each crossbolster, and there being a universal joint between each arm and bolster.

2. In a car truck, the combination with a truck frame, of a air of crossbolsters, yieldingly mounted in said frame,'and a substantially X-shapedcenter bolster supported by said cross bolsters and connected thereto byuniversal joints.

3. In a car truck, the combination with cross bolsters, of a centerbolster yieldingly connected to said cross bolsters, and side bearingssupported on said center bolster.

4. In a car truck, the combination with a pair of yieldingly mountedcross bolsters, of a center bolster flexibly connected to and supportedby said cross bolster, and side bearing supports on said center bolster.

5. In a car truck, a pair of cross .bolsters, and a center bolsterhaving a pair of universal joint connections with each cross bolster. 6.In a car truck, a pair of cross bolsters, a center bolster having a pairof universal joint connections with each of said cross bolsters, andside bearing supports on said center bolster.

7. In a car truck, a pair of cross bolsters provided with bearing seats,and a substantially.X-shaped center bolster, the ends of the arms ofwhich center bolster are mounted for universal movement in the seats onthe cross bolsters.

8. In a car truck, a pair of cross bolsters provided with bearing seats,a substantially X-shaped center bolster, the ends of the arms of whichcenter bolster are mounted for universa. movement in the seats on. thecross bolsters, and side bearing arches on said J center bolster. i

9. In a car truck, a pair of cross bolsters;

and a center bolster flexibly'connected-at separate points to each crossbolster.

10. In a car truck, a pair of cross bolsters, and a center bolsteryieldingly connected at two separated points to each cross bolster.

11. In a car truck, a pair of cross bolsters, and a center bolsterhaving pairs of arms which are supported by and yieldingly connected tosaid cross bolsters.

In testimony whereof'I hereunto affix my signature in the presence oftwo witnesses, this'29th day of August, 1913.

HARRY M. PFLAGER.

Witnesses:

FRED H. BLANKENHORN, HAL G. Bnnnvinne.

